Futaba Sakura | Breached Privacy

With a case of social anxiety bordering on agoraphobia developed from the trauma of losing her mother Wakaba Isshiki, combined with her generally introverted personality, Futaba is strongly uncomfortable with going outside. When the protagonist first meets her, she is a shut-in who does not attend school and almost never leaves her room. She communicates with the world remotely via the Internet, and her adoptive father Sojiro Sakura enables her lifestyle out of guilt that he could not protect her from trauma. Having disconnected herself from humanity and the world beyond her apartment, Futaba suffers from suicidal depression, crippling bouts of anxiety and would freak out instantly when seeing unknown people inside Sojiro's house. When first encountered, Futaba is so consumed with self-loathing that she suppresses her desire to live, causing her Shadow Self to develop a much more helpful personality than average, one who only desires Futaba's happiness. Prior to her Change of Heart, she thinks that her room is the only place she actually feels safe to dwell within due to the frequent hallucinations she has about Wakaba bearing hatred on her.

Even before her mother's death, Futaba was quite a lonely child growing up. Part of this was due to her isolation for being a genius, with other students thinking she was a freak due to her eidetic memory (things she's reminded of when she's given a tour of Shujin), while the other part was due to her mother working long hours to support her, meaning the two hardly ever got to spend time together. It got to the point where Futaba would sometimes think her mother cared more about her research than she did about her, an insecurity that only worsened when her mother died and she was read the fake note. Because of her desire for her mother to be alive again, and the belief that she deserves to die, Futaba ended up creating a Palace where her mother wants her dead. With the help of the Phantom Thieves, however, she realizes that the note was forged and manages to remember the real Wakaba. Futaba is also very fond of sushi and Sojiro's curry, both of which were meals she shared with her mother. Despite her social ineptness and anxiety, Futaba has little problem talking to people as long as the subject interests her. When Makoto is originally attempting to help Futaba open up, she has little success bringing up mundane topics like food and the weather (the latter meaning nothing to former shut-in Futaba). However, once Yusuke starts rearranging her Featherman figures, Futaba begins passionately arguing with him, which soon turns into an actual discussion, allowing Makoto to deduce that she's simply not interested in mundane topics.

Futaba is a prolific hacker. As the original Medjed, her skills were of worldwide fame, even if her own identity remained anonymous. Sometimes she is shown to use this without regard for privacy or consequences, such as her bugging of Leblanc to keep an eye on Sojiro, bugging the protagonist's phone camera so she can keep an eye on them during their trip to Hawaii, and finding out her Uncle's financial history (which Sojiro had to point out was obviously illegally obtained, meaning they couldn't make use of it without getting in serious trouble). Makoto even mentions before the Hawaii trip that she's glad Futaba is on their side, recognizing she'd make a fearsome enemy.